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Since the report of the first high-efficiency, multi-layered, organic light-emitting diode (OLED) [1], much work has been carried out to improve device efficiency and stability. A very successful method for achieving such improvements is by doping a host organic layer with a fluorescent dye of high quantum yield [2,3]. However, the question as to how such dyes are selected and evalu- ated remains. Pyrazoline may be used as this material; pyrazoline derivatives are five-membered, nitrogen-containing heterocyclic compounds which have high hole-transport efficiency, excellent blue emission and high quantum yield [4,5]. Thus, pyrazoline derivatives have been widely used as fluorescent brightening agents, fluorescence chemosensors, hole-transport materials in electro- photography, OLED and as novel fluorescent materials [6e16]. Tri- phenylamine (TPA) and its derivatives has been widely investigated as hole-transporting, photovoltaic materials and electrolumines- cent materials for almost two decades [17e29]. Thus, in this work, it was considered that the incorporation of a triphenylamine fragment within a pyrazoline molecule may increase excelsior efficiency. In this context, six pyrazoline compounds were synthesized (Fig.1) and their structures determined by 1H, 13C NMR and HRMS. Fluorescence emission spectra were red-shifted in CHCl3 from 6 to 7. The solvent |
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yuxingdpy: 金币+5, 翻译EPI+1 2012-05-07 10:29:40
yuxingdpy: 金币+5, 翻译EPI+1 2012-05-07 10:29:40
| 自从有机发光二极管报导以来，人们做了许多工作来在其高效多层性上改进设备效率和稳定性。通过在有机层涂上荧光材料改进该设备是一种有效的方法。但是如何选择染色剂以及如何去除仍是一个有待解决的问题。吡唑啉也许可以用于这种材料。吡唑啉衍生物是五元的含氮杂环，这些杂环化合物具有高转移效率，而且易发蓝光。因此，吡唑啉衍生物已经成功应用于荧光试剂，以及能量转移材料中，如光敏，OLED和新荧光材料等。三苯胺及其衍生物作为能量转移，光敏材料的研究已经进行了大约20年。因此在我们的研究中，我们主要考虑吡唑啉材料与三苯胺框架的高效性。在本文中，我们合成了六个吡唑啉化合物(Fig.1) ，结构均经过1H, 13C NMR 和HRMS鉴定。在氯仿中，荧光发射谱从6发生红移到7 。 |
2楼2012-05-05 13:24:28